Hi
I so sorry that I sent a lot of mails these days. Now I summarize all the problems in this mail.
Device: IMX6DL
Kernel: 4.1.15
Environment: pulseaudio 8.0, alsa( alsactl -v : 1.1.0)
Reason:
I used "mplayer" to play audio file in "system()" before (didn't open pulseaudio).
I want to optimized that so I use Qt function(based on pulseaudio).
After I changed configuration to let the pulseaudio start when the system startup and I play audio with Qt, I found the volume was mismatch when I changed it in Qt function
(*QSoundEffect::setVolume(), range:0.0 ~ 1.0, if volume is bigger than 0.1, the voice would be biggest)
So I used "mplayer -af volume=[-20, -10, 0, 10] XXX.wav" to test again, then I found if the volume is bigger than -10, the voice would be biggest.
I can attach the output of "paplay -v test.wav",but "aplay -Dplughw:0,0 test.wav" just has a short "bit" voice either pulseaudio is opened or not.
I hope you can give me a hand again
PS: I also send a mail to alsa-user, you can follow it : https://sourceforge.net/p/alsa/mailman/message/37005410/
Best Regards
Mihan
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